“Reinventing Bach” by Paul Elie (Farrar, Straus and Giroux, $30) — Dispelling images of Bach as a stuffy church musician, Elie focuses on Bach the innovator, who restored and road-tested organs and transformed traditional chamber music into lush creations like the Brandenburg Concertos. He then connects this revised portrait with the story of how modern audio advances have enhanced Bach’s already iconic reputation for our own times.